Fortuynia arabica   Bayartogtokh, Chatterjee & Ingole,   2009 (Marine Mite)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Arthropoda
Class: Arachnida
Order:Acarina
Family:Fortuyniidae

Image copyrights: Bayartogtokh, Chatterjee et Ingole

(A) Dorsal view; (B) sensillus and bothridium; (C)
palp (right, antiaxial view); (D) chelicera (right, antiaxial view); (E) ventral view.

Description
Size: Body length 409-451 (425) μm; length of notogaster 323-348 (338) μm; width of notogaster 253-281 (263) μm.

Color: Dark brown

Rostrum distinctly projecting anteroventrally in lateral view, but rounded in dorsal view; prodorsal ridges absent; interlamellar and exobothridial setae vestigial; sensilli with densely barbed clavate head and moderately long, narrow stalk; notogastral setae thin, smooth; setae much shorter than other notogastral setae. Surface of body and leg segments with thick cerotegument being very finely punctate on dorsal and ventral plates and having rather large granules on venter of pedotectum, on lateral part of prodorsum, and around leg acetabula. Rostrum rounded in dorsal view, but conspicuously projecting anteroventrally in lateral view.
Prodorsum: Rostral seta 52-58 μm long, thin, smooth, inserted on anterolateral side of rostrum. Lamellar seta 49-55 μm long, inserted on dorsolateral side of prodorsum. Interlamellar and exobothridial setae vestigial, only their alveoli visible. Sensillus with densely barbed clavate head and moderately long stalk; its exposed portion 35-42 μm long. Bothridiuma irregular funnel-shaped, its posterior part concealed under anterior margin of notogaster. Prodorsal ridges absent.
Notogaster: Oval in dorsal aspect, about 1.3 times as long as wide; lenticulus-like light spot weakly developed on the anterocentral part of notogaster. Dorsosejugal suture complete, conspicuously arched anteriorly. Fourteen pairs of notogastral setae thin, smooth. Lyrifissures well developed, but small. Opisthosomal gland opening situated anterolateral to setae.
Gnathosoma: Infracapitular mentum wider than long, without microtubercles. Hypostomal thin, smooth. Chelicerae chelate, moderately strong, with a few small blunt teeth; setae moderately long, finely barbed; short, smooth; Tragardh’s organ inconspicuous. All setae of palp thin, smooth; anteroculminal euphathidium not fused to tarsal solenidion.
Epimeral region: Surface of epimeral region smooth; epimeral borders well developed. Epimeral setae moderately long, thin; setae 18-22 μm long; epimeral setal formula: 3-1-3-3. Discidium well developed. Pedotectum with large granular tubercles ventrally; pedotectum small.
Anogenital region: Genital aperture distinctly wider, but shorter than anal aperture; both anal and genital plates smooth. Five pairs of genital and 1 pair of aggenital setae short, thin, smooth. Anal setae 25-28 μm long, adanal setae 22-25 μm; ad1 46-52 μm long. Adanal lyrifissure iad situated in paranal position, at same level as adanal seta.
Legs: Claws of all legs rather thick. Femora and trochanters with narrowly elongated porose areas. Trochanter with distinct dorsodistal projection. Setation of legs similar to that of former species. Most of leg setae conspicuously barbed, except a few setae of trochanters and femora. Setae of genu, of tibia, and of tarsus of leg strongly thickened, with dense barbs; other setae thin, pointed distally.

Deutonymph:
Size: Body length 381 μm; length of notogaster 320 μm; width of notogaster 232 μm.
Integument: Dark brown, body and leg segments covered with thick, smooth
cerotegument; small granules present on lateral part of prodorsum.
Prodorsum: Rostral setae 32 μm long, thin, smooth, inserted in distinct tubercles. Lamellar seta long, inserted dorsally on prodorsum. Interlamellar and exobothridial setae vestigial. Sensillus with smooth clavate head and short stalk; bothridium small.
Notogaster: Oval in dorsal aspect, about 1.3 times as long as wide; dorsosejugal suture complete, broadly rounded anteriorly. Only 10 pairs of notogastral setae (some of which were broken); setae absent; setae about twice as long as posterior notogastral setae; alveolus of seta situated on ventral side of notogaster. Lyrifissures and opisthosomal gland opening absent.
Gnathosoma: Hypostomal setae and a moderately long, smooth; seta vestigial. Structures of chelicera and palp similar to those of the deutonymph of former species; formula of palpal setation: 0-2-1-3-9 including solenidion.
Epimeral region: Sejugal and 4th epimeral borders strongly developed; other epimeral borders incomplete. Epimeral setae short, thin; epimeral setal formula: 3-1-2-2.
Legs: Distal segments of most legs broken in single specimen studied here, also some setae of available segments broken. Therefore, we could not examine the details of all leg setation. Claws of leg thick, blunt at tip.
Anogenital region: Anal aperture larger than genital one; genital plates incompletely developed. In single examined specimen, 3 pairs of genital setae irregularly situated. Anal plates well developed; 2 pairs of anal and 3 pairs of adanal setae, some setae vestigial. Adanal lyrifissure iad situated at level anterior to anal aperture.

Tritonymph:
Size: Body length 432 μm; length of notogaster 346 μm; width of notogaster 347 μm.
Integument : Yellowish-brown, body and leg segments covered with thin, smooth cerotegument, and small granules present on lateral part of prodorsum.
Prodorsum: Rostral seta 42 μm long; lamellar seta 38 μm long, both inserted dorsally on small tubercles. Interlamellar and exobothridial setae not vestigial, but minute. Sensillus with smooth capitate head and short stalk; bothridium small.
Notogaster: Nearly as long as wide; dorsosejugal suture complete, almost straight and very slightly arched anteriorly; anterolateral ends of notogaster with small projections laterally. Fifteen pairs of notogastral setae thin, smooth; setae long, 78-102 μm long; short (13-28 μm); other setae similar in length (51-70 μm). Lyrifissures and opisthosomal gland opening absent.
Gnathosoma: Hypostomal setae moderately long, smooth. Chelicerae chelate, with a few blunt teeth; setae thin, smooth; Tragardh’s organ inconspicuous. Palpal setae thin, smooth; anteroculminal euphathidium not fused to tarsal solenidion; formula of palpal setation: 0-2-1-3-9 including
solenidion.
Epimeral region: Sejugal and 4th epimeral borders strongly developed; other
epimeral borders incomplete. Epimeral setal formula: 3-1-3-3.
Anogenital region: Anal aperture much larger than genital one; genital plates incompletely developed. Oblique-transversal border framing the genital region posteriorly. Anterior 2 genital papillae rounded, posterior papilla oval; 4 pairs of genital setae and 1 pair of aggenital setae short, smooth. Anal plates well developed; 2 pairs of anal and 3 pairs of adanal setae 19-25 μm long except for longest setae at 48 μm long. Adanal lyrifissure not evident.
Legs: Claws of all legs thick, blunt at tip. Femora and trochanters with large porose areas. Trochanter with distinct dorsodistal projection. All leg setae thin, pointed distally and most of ventral setae conspicuously barbed; some setae vestigial.

The adult of Fortuynia arabica is easily distinguished from those of all other species of Fortuynia by the densely barbed sensilli as opposed to the smooth sensilli in all known species, and the absence of prodorsal ridges.
The present new species can also be distinguished from another species Fortuynia taiwanica by the much longer notogastral setae as opposed to the very short setae in the compared species; a much shorter notogatsral seta rather than a long Fortuynia taiwanica, and more posterior situation of adanal seta in contrast to the anterior situation of that Fortuynia arabica.


Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology
Habitat:  Rocky, Coastal

Biogeography


• Goa, Anjuna beach INDIA
• West Coast INDIA
• Arabian Sea (Lat: 15.56) (Long: 78.74)

Literature Source(s)
  • Bayartogtokh, B; Chatterjee, T; Chan, BKK and Ingole B (2009) New species of marine littoral mites (Acari: Oribatida) from Taiwan and India, with a key to the world's species of Fortuynia and notes on their distributions Zoological Studies 48(2) 243-261 Available at - http://drs.nio.org/drs/bitstream/2264/2608/1/Zool_Stud_48_243.pdf
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org

Page last updated on:2010-08-11

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